The first stage of neutral process of sludge digestion, is

For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as

A

4.5 to 6.0

B

6.5 to 8.0

C

8.5 to 10.0

D

10.5 to 12.0

The gas from sludge digestion tank is mainly composed of

A

Nitrogen

B

Carbon dioxide

C

Hydrogen sulphide

D

Methane

In normal conditions, the period for sludge digestion, is

A

10 days

B

20 days

C

30 days

D

60 days

The principal gas evolved from sludge digestion tank is

A

CO

B

CO₂

C

CH₄

D

N₂

For normal sludge, the value of sludge index for Indian conditions is

A

0 to 50

B

50 to 150

C

150 to 350

D

350 to 500

If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called

A

Balanced beam

B

Under reinforced beam

C

Over reinforced beam

D

None of the above

In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when

A

There is no load on the generator

B

The generator runs on full load

C

The generator runs on overload

D

The generator runs on designed speed

In case of an under-reinforced beam, the depth of actual neutral axis is __________ that of the critical neutral axis.

A

Same as

B

Less than

C

Greater than

D

None of these

For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

A

Increase

B

Decrease

C

Remain unaffected

D

Other factors control it

pH value of sludge during alkaline regression stage, is

A

More than 7

B

Less than 7

C

Less than 6

D

More than 6

The first stage of neutral process of sludge digestion, is

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